A Justice Department watchdog wants an investigation into rapper 50 Cent’s financial affairs, saying pictures of him flashing cash on social media sites “are potential evidence of serious misconduct.” The federal watchdog’s request said the 40-year-old entertainer’s social media posts suggest that he “lives a lavish lifestyle” and have “invited a public perception that a bankruptcy case is an appropriate vehicle for publicity without sufficient financial accountability,” according to documents filed Monday in U.S. Bankruptcy Court in Hartford, Conn. The watchdog’s request comes less than a week after Judge Ann Nevins ordered 50 Cent, whose real name is Curtis James Jackson III, to explain his social media posts in person, citing similar concerns. She set a March 9 hearing to consider the request for an investigation. Since filing for bankruptcy in July, Mr. Jackson has posted photos that show cash piled high in his fridge and scattered on his couch.